. . "For substituents, a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkoxy group having 1 to 8 carbon atoms such as a methoxy group, an ethoxy group, ann-propoxy group, an isopropoxy group, an n-butoxy group, an isobutoxy group, a sec-butoxy group, a t-butoxy group, an n-pentyloxy group, a cyclopropyloxy group, a cyclohexylmethyloxy group and a 2-ethylh" . . . .